Asiacell In the experiment of finding the parameters of synchronous machine, the ac value of the armature resistance equal the Radc multiplied by *
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- For Problem 3.18, the motor operates at full load, at 0.8 power factor leading, and at a terminal voltage of 10.45 kV. Determine (a) the voltage at bus 1, which is the generator bus, and (b) the generator and motor internal EMFs.Fill in the data for a 16-ampere electric motor, single-phase, no Code letters. a. Branch-circuit protection, non-time-delay fuses: Normal size _____________AMaximum size _____________A Switch size _____________ASwitch size _____________A b. Branch-circuit protection dual-element, time-delay fuses: Normal size _____________AMaximum size _____________A Switch size _____________ASwitch size _____________A c. Branch-circuit protection instant-trip breaker: Normal setting _____________A Maximum setting _____________A d. Branch-circuit protectioninverse time breaker: Normal rating _____________A Maximum rating _____________A e. Branch-circuit conductor size, Type THHN Ampacity _____________A f. Motor overload protection using dual-element time-delay fuses: Maximum size _____________AThe synchronous reactance of a generator is 1.0 per unit, and the leakage reactance of itsarmature is 0.1 per unit. The voltage to neutral of phase a at the bus of a large system to which the generator is connected is 1.0∠0 ◦ per unit, and the generator is delivering a current Ia = 1.0∠− 30◦ per unit. Neglect resistance of the winding and find:a. the voltage drop in the machine due to armature reactionb. the internal voltage to neutral E of phase a of the generatorc. the per unit values of P and Q delivered to the bus Note: Equivalent circuit is shown in Fig. 1 where Xar armature reactance, Xl leakagereactance, and XS synchronous reactance
- A gas turbine, 2-pole, 3? synchronous generator rated at 200 MW is connected to the grid (presumed to be an infinite bus). The electrical operating frequency of the grid is 60 Hz, and the slope of the frequency-power curve for the generator is 15 MW/Hz. a. If the no-load setpoint for the generator is set to 63.5 Hz, how much active power will the generator provide to the grid? b. Neglecting system losses, what is the torque provided by the gas turbine? c. What would happen if the no-load setpoint for the generator is set to 59 Hz?Show that an alternator running in parallel on constant-voltage and frequency bus-bars has a natural time period of oscillation. Deduce a formula for the time of one complete oscillation and calculate its value for a 5000-kVA, 3-phase, 10,000-V machine running at 1500 r.p.m. on constant 50-Hz bus-bars. The moment of inertia of the whole moving system is 14,112 kg-m2 and the steady short-circuit is five times the normal full-load value. ANSWER IS [1.33 second]A Y- connected, 10-KVA, 230- has a field winding resistance of 4.59. At an operation of 0.85 lagging power factor, the excitation current is recorded at 10A. the core loss is 300W, and the mechanical loss is 200W. If the corresponding efficiency is 84.9%. calculate the per- phase armature winding resistance.
- A 100KVA, 6.6 kV 3 PHASE star connected cylindrical pole synchronous generator has 20-ohm as synchronous reactance and the armature resistance is negligible and the generator is working at the full load and unity power factor then find the value of the induced emf voltage(line to line). Answer fastA synchronous generator of 100 MVA, 14.4kv, power factor 0.8 lagging, connected in Y, has a resistor in the armature negligible, a synchronous reactance of 1.0 per unit and a speed drop of 3%. The generator is connected in parallel with an infinite bus of 60hz and 14.4kv. a) What is the synchronous reactance of the generator in ohms? b) what is the internal voltage generated in nominal conditions? c) what is the frequency without load of the generator so that it delivers the nominal power of the system? d) Assume that the generator initially operates at nominal conditions. if it decreases 5% generated internal voltage Ea, what will be the new armature current Ia?DC Electric Machine: synchronous machine: Which option is correct for the graph given regarding the synchronous machine? The order should be: name of the characteristic / run in (1) / run in (2) / run in (3) A) Idle running characteristic of the motor / capacitive / ohmic / Inductive. B) Setting characteristic of the generator / Pure inductive / ohmic / Pure capacitive. C) Setting characteristic of the generator / Inductive / ohmic / capacitive. D) External characteristic of the generator / capacitive / ohmic / Inductive. E) External characteristic of the motor / Inductive / ohmic / capacitive
- Electric Machine; Consider the above equivalent circuit of Synchronous Machine. The nominal values of a star connected synchronous generator are : 75 MVA, 12.5 kV, 50Hz , 3000 rpm .Since the synchronous reactance of this machine x0= 80% and artery resistance r=1.5 mΩ, calculate the values of induced pole wheel voltage (Ef) a)while the machine is running ohmic(cos(Ø) = 1 at rated load b)while the machine is running ohmic(cos(Ø) = 0.8(end) at rated loadA 3 phase, star connected synchronous generator supplies current of 10A having phase angle of 20º lagging at 400V. Find the load angle and the components of armature current Id and Iq if Xd = 10 ohm and Xq = 6.5 ohm Assume armature resistances to be negligibleCompare and contrast a cumulative compound DC generator and a differential compound DC generator in terms of performance. Note: Explain in no more than 70 words